Ndak is a colloquial term commonly used in Kenya, which means "no" or "I don't have". It is a Swahili phrase that has become a popular slang in the country. There are different synonyms for the word ndak, and some of them include "haina", "hapana", "nada", "hakuna", "hamna", and "sifanyi". These words all have a similar meaning to ndak and are often used interchangeably. Ndak has become a staple in the Kenyan street language and is used in everyday conversations, especially when there is a need to express the absence of something or the inability to perform an action.